[1]龚云辉,刘云根,杨思林,等.pH值对高原山地分散养殖型农村沟渠底泥磷释放的影响[J].江苏农业学报,2020,(04):955-964.[doi:doi:10.3969/j.issn.1000-4440.2020.04.021]
　GONG Yun-hui,LIU Yun-gen,YANG Si-lin,et al.Effects of pH value on the release of phosphorus from the sediment in scattered farming rural ditch in plateau region[J].,2020,(04):955-964.[doi:doi:10.3969/j.issn.1000-4440.2020.04.021]
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pH值对高原山地分散养殖型农村沟渠底泥磷释放的影响()
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江苏农业学报[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2020年04期
页码:
955-964
栏目:
耕作栽培·资源环境
出版日期:
2020-08-31

文章信息/Info

Title:
Effects of pH value on the release of phosphorus from the sediment in scattered farming rural ditch in plateau region
作者:
龚云辉1; 刘云根1; 2; 杨思林1; 王妍1; 2; 杜鹏睿1; 张晋龙1
(1.西南林业大学生态与环境学院，云南昆明650224;2.云南省山地农村生态环境演变与污染治理重点实验室，云南昆明650224）
Author(s):
GONG Yun-hui1; LIU Yun-gen1; 2; YANG Si-lin1; WANG Yan1; 2; DU Peng-rui1; ZHANG Jin-long1
(1. College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China;2.Key Laboratory of Ecological Environment Evolution and Pollution Control in Mountainous Rural Areas, Kunming 650224, China)
关键词:
高原山地; 分散养殖; 沟渠底泥; pH; 磷形态; 释放通量; 微生物
Keywords:
plateau region; scattered farming; ditch sediment; pH; phosphorus forms; release flux; microorganisms
分类号:
X171.4
DOI:
doi:10.3969/j.issn.1000-4440.2020.04.021
文献标志码:
A
摘要:
以典型高原山地分散养殖型农村沟渠底泥为研究对象，通过室内模拟灭菌和未灭菌处理条件下pH为5.5、7.5、9.5、11.5的环境条件，估算底泥-水界面总磷(TP）和正磷酸盐(PO3-4-P）释放通量变化，研究pH对底泥磷释放及各形态磷含量变化的影响。结果表明，沟渠底泥中铁铝结合态磷(NaOH-P）占TP比例最高，钙结合态磷(HCl-P）次之，有机磷(OP）则相对较少；NaOH-P和OP占TP的比例随pH的升高而降低，HCl-P则相反。随时间推移，NaOH-P和HCl-P占TP比例在15 d时出现拐点，均呈现先增后减趋势；OP则先降后增；碱性条件(pH＞9.5）更有利于底泥磷释放，且底泥中各形态磷在pH影响下存在相互转化的可能性。冗余分析结果表明，酸性条件下(pH=5.5）pH与HCl-P含量为正相关关系，中性条件下(pH=7.5）pH与NaOH-P、HCl-P含量为负相关关系，碱性条件下(pH≥9.5）pH与NaOH-P含量呈正相关关系。未灭菌处理组的释放通量和上覆水中TP、PO3-4-P质量浓度始终高于灭菌处理组，强碱性条件下(pH=11.5）TP和PO3-4-P的释放通量分别是酸性条件下(pH=5.5）的13和24倍，微生物对于底泥中各形态磷转化为PO3-4-P进入上覆水体的影响较小。说明沟渠底泥在碱性条件下磷释放潜力较大，微生物能够促进底泥中磷释放，增加底泥磷向上覆水释放的风险。
Abstract:
Taking the sediment in rural ditches of typical highland and mountainous areas as the research object, the environmental conditions with pH values of 5.5, 7.5, 9.5 and 11.5 at the sterilized and unsterilized treatment conditions were simulated indoors to estimate the flux change of total phosphorus (TP) and soluble orthophosphate (PO3-4-P) at the sediment-water interface, and the effects of pH on phosphorus release from sediment and the content change of various forms of phosphorus were studied. The results showed that the proportion of Fe-Al bound phosphorus (NaOH-P) in TP was the highest, followed by Ca-bound phosphorus (HCl-P), and the proportion of organic phosphorus (OP) was relatively low. The proportion of NaOH-P and OP in TP decreased with the increase of pH, while the proportion of HCl-P in TP increased with the increase of pH. With the passage of time, the proportion of NaOH-P and HCl-P in TP showed an inflection point at 15 days, and increased first and then decreased. The proportion of OP in TP decreased first and then increased. Alkaline condition (pH>9.5) was more conductive to the release of phosphorus from the bottom sediment, and there was the possibility of mutual transformation of phosphorus in the bottom sediment under the influence of pH. The results of redundancy analysis indicated that pH was positively correlated with HCl-P content under acidic condition (pH=5.5). Under neutral condition (pH=7.5), pH was negatively correlated with NaOH-P content and HCl-P content. The pH was positively correlated with NaOH-P content under alkaline conditions (pH≥9.5). The release flux and the mass concentrations of TP and PO3-4-P in the overlying water in the unsterilized treatment group were always higher than those in the sterilized treatment group. The release fluxes of TP and PO3-4-P under strong base condition (pH=11.5) were 13 times and 24 times higher than those under acidic condition (pH=5.5). Microorganisms had little influence on the transformation of phosphorus from sediment into PO3-4-P. It is revealed that the phosphorus release potential of bottom sediment is great under alkaline conditions, and the microorganisms can promote the release of phosphorus in the bottom sediment and increase the release risk of phosphorus from the bottom sediment to the overlying water.

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备注/Memo

备注/Memo:
收稿日期：2020-01-18基金项目：国家自然科学基金项目(41761098、21767027)；云南省教育厅科学研究基金项目(2019Y0131）作者简介：龚云辉(1994-)，男，彝族，云南玉溪人，硕士研究生，研究方向为环境生态。(E-mail)1341310581@qq.com通讯作者：杨思林,(E-mail)84458250@qq.com
更新日期/Last Update: 2020-09-08